4-28 Answer true or false.
(a) A net ionic equation shows only those ions that undergo
(b) In a net ionic equation, the number of moles of starting material must equal the number of moles of product.
(c) A net ionic equation must be balanced by both mass and charge.
(d) As a generalization, all lithium, sodium, and potassium salts are soluble in water.
(e) As a generalization, all nitrate (NO3- salts are soluble in water.
(f) As a generalization, most carbonate (CO3) salts are insoluble in water.
(g) Sodium carbonate, Na2CO3, is insoluble in water.
(h) Ammonium carbonate, (NH4 )2CO3, is insoluble in water.
(j) Calcium carbonate, CaCO3, is insoluble in water.
(j) Sodium dihydrogen phosphate, NaH2PO4, is insoluble in water.
(k) Sodium hydroxide, NaOH, is soluble in water.
(l) Barium hydroxide, Ba(OH)2, is soluble in water.
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Chapter 4 Solutions
Bundle: Introduction to General, Organic and Biochemistry, 11th + OWLv2, 4 terms (24 months) Printed Access Card
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- 4-103 Caffeine, a central nervous system stimulant, has the molecular formula C8H10N402. (a) How many moles of caffeine are present in 6.19 1025 molecules of caffeine? (b) Imagine you dissolve caffeine in water to a volume of 100.0 mL, which is known to have a density of 1.23 g/mL. How many molecules of caffeine are present in this volume? (c) How many nitrogen atoms are present in 3.5 mg of caffeine? (d) Complete the skeletal structure of caffeine, where all the bonded atoms are shown but double bonds, triple bonds, and/or lone pairs are missing. (e) Identify the various types of geometries present in each central atom of caffeine using VSEPR theory. (f) Determine the various relative bond angles associated with each central atom of caffeine using VSEPR theory (g) What is the most polar bond in caffeine? (h) Would you predict caffeine to be polar or nonpolar? (j) Consider the combustion of caffeine, which results in formation of NO2(g) as well as other expected products. Write a balanced chemical equation for this reaction. (j) The heat of combustion for caffeine is 2211 kcall/mol. How much heat will be given off if 0.81 g of caffeine is burned completely? (k) Calculate the weight of H2O(g) that can be prepared from 8.00 g of caffeine mixed with 20.3 g of oxygen gas.arrow_forward4-20 Calcium oxide is prepared by heating limestone (calcium carbonate, CaCO3) to a high temperature, at which point it decomposes to calcium oxide and carbon dioxide. Write a balanced equation for this preparation of calcium oxide.arrow_forward4-25 In the chemical test for arsenic, the gas arsme, AsH3, is prepared. When arsine is decomposed by heating, arsenic metal deposits as a mirror-like coating on the surface of a glass container and hydrogen gas, H2, is given off. Write a balanced equation for the decomposition of arsine.arrow_forward
- 4-89 If 7.0 kg of is added to 11.0 kg of to form which reactant is in excess?arrow_forward4-23 When solid carbon burns in a limited supply of oxygen gas, the gas carbon monoxide, CO, forms. This gas is deadly to humans because it combines with hemoglobin in the blood, making it impossible for the blood to transport oxygen. Write a balanced equation for the formation of carbon monoxide.arrow_forward
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